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Performance of sol–gel Titanium Mixed Metal Oxide electrodes for electro-catalytic oxidation of phenol

Paper ID Volume ID Publish Year Pages File Format Full-Text
48204 46496 2008 8 PDF Available
Title
Performance of sol–gel Titanium Mixed Metal Oxide electrodes for electro-catalytic oxidation of phenol
Abstract

Mixed metal oxides SnO2–RuO2–IrO2, Ta2O5–IrO2 and RhO2–IrO2 were immobilised on a Ti substrate using sol–gel techniques. The Ti mixed metal oxides were characterized in terms of morphology using scanning electron microscopy. Cyclic voltammetric responses of phenol at Ti/SnO2–RuO2–IrO2, Ti/Ta2O5–IrO2 and Ti/RhO2–IrO2 electrodes were evaluated and showed significantly low potentials for Ti/Ta2O5–IrO2 (+100 mV), Ti/SnO2–RuO2–IrO2 (+200 mV) and Ti/RhO2–IrO2 (−100 mV). The degradation of phenol in aqueous solution and its intermediates were investigated by bulk electrolysis and quantitatively assessed by HPLC analysis to elucidate the decomposition pathways and to develop a kinetic model for the electro-catalytic oxidation of phenol over Ti mixed metal oxides. Ring compounds, benzoquinone/hydroquinone, catechol, and short chain organics, carboxylic acids, have been identified as intermediate products for the electro-catalytic oxidation of phenol. Fundamental kinetic data were obtained for the conversion of phenol at these electrodes and was found to proceed in accordance with the pseudo-first-order kinetics with respect to the phenol concentration.

Keywords
Electro-catalysis; Mixed metal oxide electrodes; Phenol oxidation
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Performance of sol–gel Titanium Mixed Metal Oxide electrodes for electro-catalytic oxidation of phenol
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis B: Environmental - Volume 84, Issues 3–4, 1 December 2008, Pages 659–666
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
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Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
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